When I'm in the USA I use the Mapopolis software for route finding when
driving and also when geocaching. Mapopolis has the ability to log your
route to a file, but it's in a plain text format and nothing seemed to be
available to convert it.

I wrote a short bit of perl that will take the mapopolis log file and
convert it to gpx, so you can load it straight into Google Earth for
example and view where you travelled.